GPT-5.1-Codex
openai/gpt-5.1-codex- OpenAI
- Family · GPT-5 Codex
- Released 13 Nov 2025
- Text · Image → Text
- Reasoning · adjustable
- Tools · JSON · Vision
Not on OSMEXO yet
Spec & list price
Context391K
Max output128K
Input / 1M$1.25
Output / 1M$10.008× input
Scores · standing
Intelligence23.7#107/490
Usage
Tokens / day30.6M▼ 49% 7d
Usage rank#360
Requests / day1.5K
Tool calls / req0.39
Per request · 30 days
Avg input22.4K1.5× median
Avg output8261.2× median
Cache hit92%1.3× median
Reasoning share72%1.3× median
Tool-call failures0.2%0.1× median
Consumption
Peak 365.9M 24 OctLow 14.3M 1 NovRank today #360
News & trends
News · latest from OpenAI
- GPT-6.1 Terra vs. Claude Opus 5.5: Cheaper and faster in three tests at maxthenewstack.io · 2 Nov
- Chinese labs now target OpenAI's GPT-6 Astra for distillationfork.zone · 1 Nov
- GPT-6.1 Terrasimonwillison.net · 31 Oct
- GPT-5.6 Sol can beat Factorio on peaceful moderyanmadden.net · 31 Oct
Benchmarks
bar = share of the top score · Benchmark data: Artificial AnalysisSpeed · median across providers, latest day
Output speed#145/33474 tok/s1.1× faster than median
First token#2792.63 s2.6× longer than median
#31 cheapest of 34 with a similar score
Value
Intelligence Index
Blended price per 1M tokens (log)
Family progress
Intelligence Index
- Family releases32.5
Technical details
- Reasoning
- on · medium
- Tokenizer
- GPT
- Moderation
- none
Reasoning effort
- high
- medium · default
- low
Request parameters 10
- tools
- tool_choice
- response_format
- structured_outputs
- reasoning
- reasoning_effort
- include_reasoning
- max_completion_tokens
- seed
- verbosity
Interesting facts
- Less output room than similar models (128.0K against a 235.9K median).
- 2nd of 3 GPT-5 Codex models by tokens last month.
When to use
Best for
- Coding agents that edit large codebases
- Long-running tool-calling developer workflows
- Code review with screenshots or diagrams
- Structured output for automated pipelines
Think twice for
- Image or audio generation
- Self-hosting (closed weights)
- Simple chat where cheaper models suffice
Same family
GPT-5 Codex- 32.5
- 24.9
- 28.5
Alternatives
other vendors · similar capability- 26.3
- T25.0
- 27.0
- 25.8
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